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Home  >  Journal list  >  Polymer Journal  >  Vol.47  No.12 (2015)  >  pp.789-795

Polymer Journal
<<Previous article Vol.47  No.12 (2015)   pp.789 - 795 Next article>>

Influence of the rigid amorphous fraction and segregation during crystallization in PHB/DGEBA blends

Sebastián Tognana1,2 and Walter Salgueiro1,2
1IFIMAT, Facultad de Ciencias Exactas, CIFICEN CONICET, UNCPBA, Tandil, Argentina
2Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, La Plata, Argentina

A SAXS study of the crystallization process in PHB and PHB/DGEBA (poly(3-hydroxybutyrate/ diglycidyl ether of bisphenol A) blends with PHB/DGEBA weight ratios of 100/0, 90/10, 70/30 and 50/50 crystallized at 60 and 100°C was performed. The measurements were performed at different stabilized temperatures between 30 and 140°C. The relaxation of the rigid amorphous fraction influences the crystallization process at crystallization temperatures higher than 70°C, and the same rigid amorphous fraction constrains the development of crystals at temperatures <70°C. Evidence for interlamellar segregation without influence from the crystallization temperature for DGEBA contents <30% and indications of interfibrillar or interspherulitic segregation for DGEBA contents >30% were observed. The results are discussed based on the segregation of DGEBA affecting the recrystallization process of PHB. At high temperatures, the co-existence of lamellae with different dimensions was observed. The results also indicate that DGEBA reduces the possibility of secondary crystallization in the blends.


Received: May 20, 2015 , Revised: July 10, 2015
Accepted: July 13, 2015 , Published online: September 09, 2015
© 2015 The Society of Polymer Science, Japan

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